如图,在Rt△ABC中,∠C=90°,BC=a,AC=b,AB=c?
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(1)
sin²A + cos²A = (BC/AB)² + (AC/AB)² = (BC² + AC²)/AB² = (a² + b²)/c² = c²/c² = 1
(2)
tanA = BC/AC = a/b
sinA/cosA = (BC/AB)/(AC/AB) = (a/c)/(b/c) = a/b
tanA = sinA/cosA,1,如图,在Rt△ABC中,∠C=90°,BC=a,AC=b,AB=c
(1)sin^2A与cos^2A有什么关系?试写出你的推导过程.
(2)tanA与sinA/cosA有何关系?试写出你的推理过程.
sin²A + cos²A = (BC/AB)² + (AC/AB)² = (BC² + AC²)/AB² = (a² + b²)/c² = c²/c² = 1
(2)
tanA = BC/AC = a/b
sinA/cosA = (BC/AB)/(AC/AB) = (a/c)/(b/c) = a/b
tanA = sinA/cosA,1,如图,在Rt△ABC中,∠C=90°,BC=a,AC=b,AB=c
(1)sin^2A与cos^2A有什么关系?试写出你的推导过程.
(2)tanA与sinA/cosA有何关系?试写出你的推理过程.
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